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Reverse Mortgages - Schedule of Loans Held For Investment and HMBS Related Borrowings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 01, 2024
Receivables [Abstract]
Unpaid principal balance	$ 10,699.5	$ 7,664.7
Fair value adjustments	425.8	305.3
Loans held for investment - reverse mortgages, beginning balance	7,970.0	7,504.1	$ 7,199.8
HMBS Related Borrowings, Beginning Balance	(7,797.3)	(7,326.8)	(6,885.0)
Originations	1,125.0	1,033.4	1,658.1
Securitization of HECM loans accounted for as a financing	(1,073.5)	(1,054.6)	(1,780.4)
Additional proceeds from securitization of HECM loans and tails	(13.2)	(11.0)	(25.2)
HMBS related borrowings, acquisitions.	(2,880.9)	0.0	(209.1)
Loans held for investment, reverse mortgages, acquisitions.	2,912.7	0.0	211.3
Repayments (principal payments received)	(1,495.4)	(1,076.9)	(1,579.9)
Repayments (principal payments received)	1,474.7	1,070.1	1,568.4
Loans held for sale, at fair value	(4.8)	(6.1)	(8.0)
Receivables, net	(3.0)	(3.4)	2.1
REO (Other assets)	(0.5)	(0.1)	(0.4)
Change in fair value	621.2	519.0	21.1
Change in fair value	(581.8)	(475.0)	4.5
Change in fair value included in earnings, net	39.4	44.0	25.6
Loans held for investment, reverse mortgages, ending balance	11,125.3	7,970.0	7,504.1
HMBS Related Borrowings, Ending Balance	(10,872.1)	(7,797.3)	$ (7,326.8)
Cash amount	20.0
Assets transferred, UPB				$ 14.2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale ($1,290.2 and $674.2 carried at fair value) ($575.4 and $269.6 related to VIEs)	11,125.3	7,975.5
Senior Lien
Receivables [Abstract]
Loans held for investment - securitized	10,950.8	7,868.5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment - securitized	10,950.8	7,868.5
Loans held for sale ($1,290.2 and $674.2 carried at fair value) ($575.4 and $269.6 related to VIEs)	$ 174.5	$ 101.5

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HMBS related borrowings, acquisitions.

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Amounts related to additional proceeds from securitization of loans and tails of home equity conversion mortgage-backed securities related borrowings accounted for as a financing.

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Amounts related to securitization of home equity conversion mortgage-backed securities related borrowings accounted for as a financing.

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This represents the amount of liability which is a resultant of reverse mortgage loans sold into the secondary with servicing rights retained. As the transfer of these loans do not meet the definition of participating interest because of the servicing requirement that requires the issuer to absorb some level of risk, these transfers are accounted for as financing.

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Change in fair value of loans held for investment, reverse mortgages during the period.

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Amount of loans held for investment, reverse mortgages transferred to loans held for sale, fair value during the period.

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Amount of loans held for investment, reverse mortgages originated during the period.

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Amount of loans held for investment, reverse mortgages transferred to real estate owned during the period.

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Amount of loans held for investment, reverse mortgages transferred to receivables during the period.

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Principal payments received on loans held for investment during the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

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